Books with ACTUAL couple chemistry?

I’m in desperate need of some book recs with a couple that has great chemistry and banter. I've lost count of the number of books where the characters just feel super bland, the 'love' super forced and unbelivable and I’m soo over it.

Ideally, I’d love some fantasy but open to any genre where the romance isn’t the main focus, but you can still feel the connection between the couple. I’m NOT looking for the typical cookie-cutter possessive enemies-to-lovers shadow-powers winged daddy trope, because let’s be real, it’s badly written and not what I’m after.

I just want a story with realistic, fun characters where the romance is more in the background but still makes you smile and you can feel actual familiarity.

I recently finished Six of Crows (against my will as my teen sister won't shut up about it) and it was just as I expected it to be – an entire books-worth of characters, all madly in love with someone from their team, all of them unable to express themselves and all of them sooo unnecessary over-the-top edgy. Yes, I know its YA and its bad by definition (not bashing on the author, I actually like his writting style). Licanus trilogy, The Unhewn Throne, Shepard King etc etc. the list is massive and they all lack the same thing wihich is a believable and natural relationship.

Any and all suggestions are welcomed.